Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/8ca4fec22230
Author: albertopq <albert.pastor@gmail.com>
Desc: Merge pull request #31213 from albertopq/1189900-statusbar-emergency

Bug 1189900 - Statusbar visible on emergency calls r=etienne

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https://hg.mozilla.org/integration/gaia-central/rev/bf8df915e602
Author: albertopq <albert.pastor@gmail.com>
Desc: Bug 1189900 - Statusbar visible on emergency calls

b2g/config/gaia.json

@@ -1,9 +1,9 @@
 {
     "git": {
-        "git_revision": "1f3bd9073e1b4bedc6b72530f8de62edd3caae3a", 
+        "git_revision": "507ba38fb64b27f87d11f4104dfcc58448e12b1a", 
         "remote": "https://git.mozilla.org/releases/gaia.git", 
         "branch": ""
     }, 
-    "revision": "7385041a90607b51176a2a79aef525d4abc6e0ad", 
+    "revision": "8ca4fec22230c6b6d62301261a6fc76a6fa64814", 
     "repo_path": "integration/gaia-central"
 }